package com.cw.demo.websocket.server;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.ApplicationRunner;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import lombok.extern.slf4j.Slf4j;

/**
 * TODO
 *
 * @author chenw
 * @date 2021/1/11
 */
@Slf4j
@Component
public class NettyServer {
    @Value("${server.netty.port}")
    private int port;
    @Autowired
    private ServerChannelInitializer serverChannelInitializer;
    @Bean
    ApplicationRunner nettyRunner() {
        return args -> {
            //new 一个主线程组
            EventLoopGroup bossGroup = new NioEventLoopGroup(1);
            //new 一个工作线程组
            EventLoopGroup workGroup = new NioEventLoopGroup();
            ServerBootstrap bootstrap = new ServerBootstrap()
                .group(bossGroup, workGroup)
                .channel(NioServerSocketChannel.class)
                .childHandler(serverChannelInitializer)
                //设置队列大小
                .option(ChannelOption.SO_BACKLOG, 1024)
                // 两小时内没有数据的通信时,TCP会自动发送一个活动探测数据报文
                .childOption(ChannelOption.SO_KEEPALIVE, true);
            //绑定端口,开始接收进来的连接
            try {
                ChannelFuture future = bootstrap.bind(port).sync();
                log.info("服务器启动开始监听端口: {}", port);
                future.channel().closeFuture().sync();
            } catch (InterruptedException e) {
                e.printStackTrace();
            } finally {
                //关闭主线程组
                bossGroup.shutdownGracefully();
                //关闭工作线程组
                workGroup.shutdownGracefully();
            }
        };
    }
}
